Don't pass cljs-repl-type to jvm repls

When running `cider-jack-in-clj&cljs` / `cider-connect-clj&cljs`, a cljs-repl-type will be passed to both jvm and cljs repls.

That results in the following code being run for the jvm repl:

```
(when cljs-repl-type
          (emit-comment (concat "ClojureScript REPL type: " (symbol-name cljs-repl-type))))
```

...which is noisy/confusing.